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Sage’s architecture for polynomials ‘under the hood’ is complex, interfacing to
a variety of C/C++ libraries for polynomials over specific rings. In practice,
the user rarely has to worry about which backend is being used.

The hierarchy of class inheritance is somewhat confusing, since most of the
polynomial element classes are implemented as Cython extension types rather
than pure Python classes and thus can only inherit from a single base class,
whereas others have multiple bases.